My DLC predictions:
1. Geno/Sora/Crono - I'm not sure how many parties are involved with Chrono Trigger but I'm going to assume it'd be easier than Dragon Quest, Geno is highly requested and at least someone at SE cares about SMRPG to allow licenses to the rights for Geno and Mallow as Spirits (plus Nintendo still acknowledges the game), and Sora would probably be easier to get than DQ because of it only being two parties involved to my knowledge (even though one is Disney, apparently they'd be fine with his inclusion, although idk if it'd be a limited time-thing or not).
Again DQ isn't impossible and I'd like Slime (though I'd be fine with a protagonist, it's just I haven't played DQ and became interested just 'cause of Slime), it just seems like a really big hassle to license compared to some other potential candidates, but maybe Nintendo could get all of the parties to cooperate and SE wouldn't be too stingy (though I fear Western players will get bad midis).
As for Sephiroth, I'm not sure.
On one hand, we already have FF7 stuff so okay.
On the other hand, the FF7 composer's situation means we're most-likely not getting any new FF7 music.
I have absolutely no idea about any other SE characters.
2. Banjo-Kazooie/Steve - B-K is a beloved game, with the characters being beloved themselves, and two Rare IPs have been found in the code (could be a mistake because of some goofball thinking Nintendo owned the games and then realizing they didn't and then they didn't remove the code, but meh it could also be a different situation involving Rare negotiations or something), and Steve is from a highly popular franchise where most of its fanbase would love to play as Steve despite his lack of a real personality, which is fine because that means he can be whatever you want like how you build and shape the world in Minecraft (although I'd really like a playable Creeper).
3. Porky or Ninten - Yes.
4. Gen 8 Pokemon - It's Pokemon.
5. Um...I don't know what to put here...I'll just say Sandbag because Super Smashing Finale or something.